by erichayes » Fri May 16, 2008 11:38 pm
Hi All,
I can type again! What I thought was Carpal Tunnel turned out to be a really nasty mutant version of gout. Nice to be back.
So let's review . . . These fuses have silver elements and silver end caps. The element part is moot, as its job is to open up when the current capacity is exceeded, regardless of material. The end caps, however, are another story. Silver is the metal with the highest conductivity of all. Period. Copper is second, followed by gold and aluminum.
Plating the silver end cap with copper does what? (Please, not the same hands.) And plating the copper plating with gold accomplishes what?
The problem with silver, as Tom pointed out in another thread somewhere, is that it tarnishes. That's why it usually isn't used as an interconnect material in an air environment. Copper is also subject to oxidation, which is why it's normally plated with tin or nickel. Gold is a noble metal, meaning it doesn't oxidize in any environment. It definitely has its place in digital circuitry, where things are either on or off--assuming the signal strength is sufficient to overcome the clock speed. In analog, gold offers no advantage over other materials/alloys normally used. And in a single frequency (50 or 60~) application such as a line fuse . . . draw your own conclusions.
pcX isn't going to get any business from me.
Eric in the Jefferson State